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From: Long permanence high altitude airships: the opportunity of hydrogen
Loses for a 20 μm membrane | Ground | 16 km | ||||
---|---|---|---|---|---|---|
 | V(H2) | V(He) | V(02) | V(H2) | V(He) | V(02) |
 | [m3gas/m2 h] | [m3gas/m2 h] | [m3gas/m2 h] | [m3gas/m2 h] | [m3gas/m2 h] | [m3gas/m2 h] |
Poly(ethylene) density 0.914Â g/cm^-3 | 7.13E-05 | 3.56E-05 | 2.12E-05 | 1.07E-05 | 5.34E-06 | 3.18E-06 |
Polyvinilecloride plasticized 10Â % | 1.25E-05 | Â | 3.69E-08 | 1.88E-06 | Â | 5.53E-09 |
Polyvinilacetate | 4.77E-05 | 2.88E-05 | 1.31E-06 | 7.15E-06 | 4.32E-06 | 1.96E-07 |
Poly(trifluorochloroethylene) film 30Â % cristallinity | 6.79E-06 | 4.91E-05 | 2.89E-07 | 1.02E-06 | 7.37E-06 | 4.33E-08 |
Mylar A | 4.7E-06 | 2.35E-06 | 2.89E-07 | 7.05E-07 | 3.52E-07 | 4.33E-08 |
Nylon 6 | Â | Â | Â | Â | 5.75E-07 | 4.12E-08 |
Nylon 11 | 1.29E-05 | 1.41E-05 | Â | 1.94E-06 | 2.11E-06 | Â |
Cellophane (relative humidity 43Â %) | 1.16E-07 | Â | 5.16E-08 | 1.73E-08 | Â | 7.74E-09 |